Resolve #3490037 "Min drupal 10.3"

Closes #3490037

src/Controller/PrivateMessageControllerInterface.php

@@ -5,7+5,7 @@
 namespace Drupal\private_message\Controller;
 
 /**
  * Handles page callbacks for the Private Message module.
  */
 interface PrivateMessageControllerInterface {
 
@@ -34,7+34,7 @@
   public function pmThreadSettingsPage(): array;
 
   /**
+   * Provides a controller for the private_message.admin_config.config route.
+   *
+   * @return array
+   *   Render array.
+   */
+  public function configPage(): array;
+
+    /**
    * The page for preparing to uninstall the module.
    *
    * @return array